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Acquisition, Restructuring and Management Fee Costs - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended				12 Months Ended
	Sep. 26, 2021		Sep. 27, 2020		Sep. 26, 2021		Sep. 27, 2020		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Acquisition restructuring and management fee costs	$ 23,618		$ 1,986		$ 47,666		$ 8,289		$ 15,832	$ 8,604	$ 22,022
Professional fees directly attributable to acquistion									4,434	1,404	7,933
Restructuring costs	$ 140	[1]	$ 955	[1]	1,265	[1]	$ 4,323	[1]	5,309	3,538	1,220
Sentinel Capital Partners[Member]
Restructuring Cost and Reserve [Line Items]
Aacquisition costs and management fees					$ 23,275				$ 6,089	$ 3,662	$ 12,869
[1] Includes costs incurred as part of the restructuring of operations including professional and consulting services.

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Acquisition Costs and Management Fees

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Professional fees directly attributable to acquistion.

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Acquisition, restructuring and management fees.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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